适用于介质温度-46℃～ -196℃的阀门称之为低温阀门。

Valves suitable for medium temperatures ranging from -46 ℃ to -196 ℃ are called low-temperature valves.

低温阀门包括低温球阀、低温闸阀、低温截止阀、低温阀、低温止回阀，低温蝶阀，低温针阀，低温节流阀，低温减压阀等，主要用于乙烯，液化天然气装置，天然气LPG LNG储罐，接受基地及卫星站，空分设备，石油化工尾气分离设备，液氧、液氮、液氩、二氧化碳低温贮槽及槽车、变压吸附制氧等装置上。输出的液态低温介质如乙烯、液氧、液氢、液化天然气、液化石油产品等，不但易燃易爆，而且在升温时要气化，气化时，体积膨胀数百倍。

Low temperature valves include low-temperature ball valves, low-temperature gate valves, low-temperature globe valves, low-temperature safety valves, low-temperature check valves, low-temperature butterfly valves, low-temperature needle valves, low-temperature throttle valves, low-temperature pressure reducing valves, etc. They are mainly used in ethylene, liquefied natural gas devices, natural gas LPG LNG storage tanks, receiving bases and satellite stations, air separation equipment, petrochemical tail gas separation equipment, liquid oxygen, liquid nitrogen, liquid argon, carbon dioxide low-temperature storage tanks and tank trucks On devices such as pressure swing adsorption for oxygen production. The output liquid low-temperature media, such as ethylene, liquid oxygen, liquid hydrogen, liquefied natural gas, liquefied petroleum products, etc., are not only flammable and explosive, but also need to be gasified during heating. During gasification, the volume expands hundreds of times.

液化天然气阀门的材料非常重要，材质不合格，会造成壳体及密封面的外漏或内漏；零部件的综合机械性能、强度和钢度满足不了使用要求甚断裂。导致液化天然气介质泄漏引起爆炸。因此，在开发、设计、研制液化天然气阀门的过程中，材质是首要关键的问题。

The material of liquefied natural gas valves is very important. If the material is not qualified, it can cause external or internal leakage of the shell and sealing surface; The comprehensive mechanical performance, strength, and rigidity of the components cannot meet the usage requirements or even break. Causing the leakage of liquefied natural gas medium and causing explosions. Therefore, in the process of developing, designing, and developing liquefied natural gas valves, material is the primary and critical issue.

1．设计：API6D、JB/T7749

1. Design: API6D, JB/T7749

2．阀门常规检查和试验：按API598标准。

2. Routine inspection and testing of valves: According to API598 standard.

3．阀门低温检查和试验：按JB/T7749。

3. Low temperature inspection and testing of valves: According to JB/T7749.

4．驱动方式：手动、伞齿轮传动及电动驱动装置。

4. Drive mode: manual, bevel gear transmission, and electric drive device.

5．阀座形式：阀座采用焊接结构，密封面堆焊钴基硬质合金，保证阀门的密封性能。

5. Valve seat form: The valve seat adopts a welded structure, and the sealing surface is welded with cobalt based hard alloy to ensure the sealing performance of the valve.

6．闸板采用弹性结构，在进压端设计卸压孔。

6. The gate adopts an elastic structure and a pressure relief hole is designed at the inlet end.

7．单向密封的阀门阀体上标有流向标志。

7. The valve body of a one-way sealed valve is marked with a flow direction mark.

8．低温球阀、闸阀、截止阀，蝶阀采用长颈结构，以保护填料。

8. Low temperature ball valves, gate valves, globe valves, and butterfly valves adopt a long neck structure to protect the packing.

9．超低温球阀标准：JB/T8861-2004

9. Standard for ultra-low temperature ball valves: JB/T8861-2004

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